EP3905849B1 - Heating device - Google Patents

Heating device Download PDF

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Publication number
EP3905849B1
EP3905849B1 EP20736226.0A EP20736226A EP3905849B1 EP 3905849 B1 EP3905849 B1 EP 3905849B1 EP 20736226 A EP20736226 A EP 20736226A EP 3905849 B1 EP3905849 B1 EP 3905849B1
Authority
EP
European Patent Office
Prior art keywords
central part
edge
antenna
heating chamber
cylinder body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP20736226.0A
Other languages
German (de)
French (fr)
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EP3905849A4 (en
EP3905849A1 (en
Inventor
Haijuan WANG
Peng Li
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Haier Smart Home Co Ltd
Original Assignee
Haier Smart Home Co Ltd
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Publication date
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Publication of EP3905849A1 publication Critical patent/EP3905849A1/en
Publication of EP3905849A4 publication Critical patent/EP3905849A4/en
Application granted granted Critical
Publication of EP3905849B1 publication Critical patent/EP3905849B1/en
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Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00Heating by electric, magnetic or electromagnetic fields
    • H05B6/46Dielectric heating
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00Heating by electric, magnetic or electromagnetic fields
    • H05B6/02Induction heating
    • H05B6/10Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12Cooking devices
    • A23L3/365
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25DREFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D23/00General constructional features
    • F25D23/12Arrangements of compartments additional to cooling compartments; Combinations of refrigerators with other equipment, e.g. stove
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00Heating by electric, magnetic or electromagnetic fields
    • H05B6/46Dielectric heating
    • H05B6/62Apparatus for specific applications
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00Heating by electric, magnetic or electromagnetic fields
    • H05B6/64Heating using microwaves
    • H05B6/72Radiators or antennas

Definitions

  • the present invention relates to kitchen appliances, and particularly relates to an electromagnetic wave heating device.
  • the quality of the food is maintained, but the frozen food needs to be thawed before processing or eating.
  • the food is generally thawed by an electromagnetic wave device.
  • the temperature uniformity of the thawed food is closely related to the distribution uniformity of electromagnetic waves in a heating chamber.
  • the electromagnetic waves in the heating chamber will be concentrated at the peripheral edge of the radiating antenna due to the edge effect of the radiating antenna.
  • the radiating antenna is configured to at least cover one inner wall of the heating chamber, so that the food is thawed uniformly.
  • this solution not only has high production cost, but also cannot solve the problem that electromagnetic waves arc concentrated at the peripheral edge of the antenna to cause local heating or even ignition of the antenna.
  • CN102525249B discloses a heating cooking device capable of inhibiting the radiation of the microwaves from the periphery of the antenna.
  • the antenna (23) in a curved shape, approaches the base board (11a) of a housing (11) by moving toward the periphery away from the upper end portion of a cable shaft (20).
  • US8987644B2 discloses a high-frequency heating apparatus including a heating chamber to which a heating plate for loading a subject to be heated thereon is detachably attached, a microwave generating unit, a waveguide for transmitting a microwave from the microwave generating unit, a rotation antenna for radiating the microwave into the heating chamber from the waveguide, a driving unit for turning/driving the rotation antenna, an operating portion capable of choosing the grill menu by which the subject to be heated put on the heating plate is heated and a hot-up menu by which the subject to be heated is heated without the heating plate, and a controlling unit for controlling the driving unit based on an output signal form the operating portion, wherein the controlling unit controls to vary a direction of a sharp portion of a radiation directivity of the rotation antenna in response to the output signal from the operating portion.
  • CN102644946A relates to a cooking device comprising a body, a microwave generator, a rotatable antenna, a current/voltage detection unit and a control unit, wherein the body forms a cooking box including a plurality of zones; each one of the zones is used for containing the objects; the microwave generator generates the microwave; the rotatable antenna radiates the microwave generated by the microwave generator to the cooking box, and has directivity; the current/voltage detection unit and a control unit detects the change of the current or voltage of the microwave generating unit related with the position of the rotatable antenna when the rotatable antenna performs on rotation; and the control unit determines the position of the rotatable antenna when the microwave generator gets the operation efficiency being greater than the preset value according to the change of the current or voltage detected by the current/voltage detection unit, and suspends the rotatable antenna at the determined position.
  • CN1237308C discloses a high-frequency cooker with an antenna driving part 17 for stopping the antenna 16 at a first position for radiating the microwaves from at least a specific position of die antenna 16 and at a second position for radiating the microwaves from the circumference of the antenna 16 by vertically moving the antenna 16 disposed in a lower part of a food mounting surface 11 of a heating chamber 7. Further, an infrared sensor 18 for detecting the temperature of the food and a control part for controlling a magnetron 15 are present. The control part is so structured as to determine the position of the antenna 16 according the detected temperature by the infrared sensor 18.
  • EP3240366 A1 discloses a waveguide structure antenna (5) with a ceiling surface (9) and side wall surfaces (10a, 10b, 10c) defining a waveguide structure section (8), as well as a front opening (13) to emit microwaves from front opening (13) toward a heating-target object.
  • JP2010199009A teaches the arrangement of the bent portion 19 at an edge portion of a horn antenna 7 opening, for making directivity in the direction of the opening and the directivity in the direction of the bent portion compatible.
  • a targeted one between the two can be heated intensively as the directivity in the opening direction of the horn antenna 7 becomes dominant, and outward directivity from the center of a heating chamber bottom surface becomes higher.
  • EP2348257 (A1 ) discloses a heating chamber (34) provided with glass-fitted door (31b) at a front opening, for housing an object to be heated, a waveguide (33) for transmitting microwaves from microwave generating section (32) to heating chamber (34), a directional feeding section (39) having directivity, for supplying the microwaves from waveguide (33) to heating chamber (34), a driving section (41) for rotationally driving directional feeding section (39) and a control section (411) for controlling driving section (41) to turn directional feeding section (39) to a direction of the door and supply the microwaves into a space above the tray, using the inside of the glass as a principal transmission channel, wherein a defrosting function and a grilling function arc performed in an automatic and continuous manner without a user's operation.
  • an electromagnetic wave heating device with low production cost and uniform distribution of electromagnetic waves is required in design.
  • One objective of the present invention is to provide an electromagnetic wave heating device with low production cost and uniform distribution of electromagnetic waves.
  • the present invention provides a heating device, including:
  • the radiating antenna includes:
  • the connecting part is configured to extend divergently from a peripheral edge of the central part to an inner peripheral edge of the edge part.
  • the connecting part includes:
  • geometric centers of the central part, the connecting part and the edge part all coincide with a center of a maximum cross section of the heating chamber taken along an imaginary plane parallel to the central part.
  • the central part is in a shape of an oblong; and a length direction of the central part is parallel to a length direction of the cross section.
  • a length of the central part is 0.386 to 0.522 times a length of the cross section;
  • the central part extends horizontally
  • the heating device further includes:
  • the central part is provided with a plurality of engaging holes
  • the present invention creatively disposes the radiating antenna to arch in a direction close to the object to be processed, which can relatively reduce the distance between the center of the radiating antenna and a receiving pole and increase the distance between the peripheral edge of the radiating antenna and the receiving pole, thereby eliminating the influence of an edge effect on the distribution uniformity of the electromagnetic waves in the heating chamber, and increasing the energy density and distribution range of the electromagnetic waves while solving the problem of the production cost and improving the distribution uniformity of the electromagnetic waves.
  • FIG 1 is a schematic structural view of a heating device 100 according to one embodiment of the present invention.
  • Figure 2 is a schematic cross-sectional view of the heating device 100 as shown in Figure 1 , wherein an electromagnetic generating module 161 and a power supply module 162 are omitted.
  • the heating device 100 may include a cylinder body 110, a door body 120, an electromagnetic generating module 161, a power supply module 162 and a radiating antenna 150.
  • a heating chamber 111 having a pick-and-place opening is defined in the cylinder body 110, and the heating chamber 111 is configured to place an object to be processed.
  • the pick-and-placc opening may be formed in the front wall or the top wall of the heating chamber 111 so as to pick and place the object to be processed.
  • the door body 120 may be installed together with the cylinder body 110 by an appropriate method, such as a sliding rail connection, a hinged connection, etc., and is configured to open and close the pick-and-place opening.
  • the heating device 100 also includes a drawer 140 for carrying the object to be processed; a front end plate of the drawer 140 is configured to be fixedly connected with the door body 120, and two lateral side plates of the drawer are movably connected with the cylinder body 110 by sliding rails.
  • the power supply module 162 may be configured to be electrically connected with the electromagnetic generating module 161 to provide electric energy to the electromagnetic generating module 161, so that the electromagnetic generating module 161 generates electromagnetic wave signals.
  • the radiating antenna 150 may be disposed in the cylinder body 110 and is electrically connected with the electromagnetic generating module 161 to generate electromagnetic waves of corresponding frequencies according to the electromagnetic wave signals, so as to heat the object to be processed in the cylinder body 110.
  • the radiating antenna 150 may be disposed at the top, bottom, two lateral sides or rear of the cylinder body 110.
  • the radiating antenna 150 may be disposed at the peripheral side or bottom of the cylinder body 110.
  • the radiating antenna 150 is disposed at the bottom of the cylinder body 110 to avoid the damage to the antenna due to an excessively high object to be processed in the drawer 140, and the antenna may be hidden by the drawer 140.
  • the technical solution of the present invention is described in detail by taking the radiating antenna 150 disposed at the bottom of the cylinder body 110 as an example.
  • the cylinder body 110 may be made of metals to serve as a receiving pole to receive electromagnetic waves generated by the radiating antenna 150.
  • a receiving pole plate may be disposed on the top wall of the cylinder body 110 to receive electromagnetic waves generated by the radiating antenna 150.
  • FIG 4 is a schematic structural view of an electrical appliance chamber 112 according to one embodiment of the present invention.
  • the radiating antenna 150 may be configured to arch upward to relatively reduce the distance between the center of the radiating antenna 150 and the top wall of the cylinder body 110 and increase the distance between the peripheral edge of the radiating antenna 150 and the top wall of the cylinder body 110, thereby eliminating the influence of an edge effect on the distribution uniformity of the electromagnetic waves in the heating chamber 111, and increasing the energy density and distribution range of the electromagnetic waves while improving the distribution uniformity of the electromagnetic waves.
  • edge effect means that the magnetic field intensity at the peripheral edge of the antenna is much higher than the magnetic field intensity at the center of die antenna.
  • the radiating antenna 150 includes a central part 150a, an edge part 150c and a connecting part 150b for connecting the central part 150a and the edge part 150c.
  • the central part 150a may extend along a horizontal direction.
  • the edge part 150c may be disposed under the central part 150a, and extends parallel to the central part 150a.
  • the connecting part 150b is configured to divergently extend from the peripheral edge of the central part 150a to the inner peripheral edge of the edge part 150c, so as to further improve the distribution uniformity of the electromagnetic waves in the heating chamber 111.
  • the connecting part 150b includes a first arc segment, a straight-line segment and a second arc segment which are sequentially connected from the peripheral edge of the central part 150a to the inner peripheral edge of the edge part 150c, wherein the first arc segment is configured to be tangent to the central part 150a, the straight-line segment is configured to be tangent to the first arc segment, and the second arc segment is configured to be tangent to the straight-line segment and the edge part 150c, so as to avoid the generation of the edge effect at sharp corners, and further improve the distribution uniformity of the electromagnetic waves in the heating chamber 111.
  • the geometric centers of the central part 150a, the connecting part 150b and the edge part 150c all coincide with the center of a maximum cross section of the heating chamber 111 taken along an imaginary plane extending horizontally, so as to enable the electromagnetic waves in the heating chamber 111 to be distributed more uniformly.
  • the heating chamber 111 may be in a shape of a rectangle.
  • the central part 150a may be in a shape of an oblong, and the length direction of the central part 150a may be parallel to the length direction of the above-mentioned cross section, so that the electromagnetic waves in the heating chamber 111 are distributed more uniformly.
  • the length w 1 of the central part 150a may be 0.386 to 0.522 (such as 0.386, 0.45 or 0.522) times the length W of the above-mentioned cross section.
  • the width d 1 of the central part 150a may be 0.19 to 0.471 (such as 0.19, 0.2, 0.375 or 0.471) times the width D of the above-mentioned cross section.
  • the fillet radius of the central part 150a may be 0.2 to 0.4 (such as 0.2, 0.33 or 0.4) times die width d 1 of the central part 150a.
  • the length w 2 of the outer end edge of the edge part 150c may be 0.519 to 0.674 (such as 0.519, 0.6 or 0.674) times the length W of the above-mentioned cross section.
  • the width d 2 of the outer end edge of the edge part 150c may be 0.38 to 0.62 (such as 0.38, 0.5 or 0.62) times the width D of the above-mentioned cross section.
  • the fillet radius of the outer end edge of the edge part 150c may be 0.2 to 0.4 (such as 0.2, 0.33 or 0.4) times the width d 2 of the outer end edge of the edge part 150c.
  • the radius r 1 of the first arc segment may be greater than or equal to 1/3 of the spacing (h 1 -h 2 ) between the central part 150a and the edge part 150c in a vertical direction, for example, may be 1/3, 2/5 or 1/2 of the spacing between the central part 150a and the edge part 150c in a vertical direction.
  • An included angle ⁇ between the straight-line segment and the central part 150a may be 120° to 160°, such as 120°, 140° or 160°.
  • the radius r 2 of the second arc segment may be greater than or equal to 1/6 of the spacing (h 1 -h 2 ) between the central part 150a and the edge part 150c, for example, may be 1/6, 1/5, 1/3 or 1/2 of the spacing between the central part 150a and the edge part 150c in a vertical direction.
  • the production cost can be saved, and at the same time, the electromagnetic waves in the heating chamber 111 can have a relatively large distribution area in the horizontal direction.
  • the central part 150a may be disposed at a height (h 1 /H) of 0.285 to 0.5 (such as 0.285, 0.292, 0.33, 0.4 or 0.5) of the cylinder body 110.
  • the edge part 150c may be disposed at a height (h 2 /H) of 0.19 to 0.334 (such as 0.19, 0.195, 0.2, 0.25 or 0.334) of the cylinder body 110.
  • the volume of the heating chamber 111 can be relatively large, and at the same time, the electromagnetic waves in the heating chamber 111 can have a relatively high energy density.
  • FIG 8 is a test view of a radiating antenna according to one embodiment of the present invention.
  • FIG 10 is a test view of a radiating antenna according to a comparative example of the present invention.
  • the radiating antenna is a flat plate antenna, and the antenna is in a shape of an oblong, with a length of 205 mm, a width of 115 mm, a fillet radius of 38 mm, and a distance of 50 mm between the antenna and the bottom wall.
  • Figure 9 is a simulated view of distribution of electromagnetic waves measured by Figure 8 .
  • Figure 11 is a simulated view of distribution of electromagnetic waves measured by Figure 10 .
  • both the simulated view in Figure 9 and the simulated view in Figure 11 are set as follows: when the magnetic field intensity at any spatial point in the cylinder body is greater than an intensity value (the intensity value is the difference between the magnetic field intensity at the center of the antenna in the embodiment of Figure 8 and the magnetic field intensity at the center of the antenna in the comparative example of Figure 10 ), the spatial point is shown as having electromagnetic waves.
  • the radiating antenna 150 in the embodiment of the present invention has no hidden trouble of magnetic field concentration and has a uniform distribution and a relatively large distribution range of electromagnetic waves.
  • Table 1 Electric field intensity test table a Measuring point X Y Z Electric field intensity m1 15.500 66.000 401.830 2.782e+003 m2 15.500 66.000 457.700 3.059e+003 m3 110.500 66.000 401.830 3.181e+003 m4 15.500 66.000 347.700 2.829e+003 m5 -79.500 66.000 401.830 3.060e+003
  • Table 2 Electric field intensity test table b Measuring point X Y Z Electric field intensity m1 15.600 66.000 401.830 1.206e+003 m2 15.500 66.000 457.700 1.813e+003 m3 110.500 66.000 40
  • Table 1 is an electric field intensity test table in Figure 9 .
  • Table 2 is an electric field intensity test table in Figure 11 . It can be seen from Table 1 and Table 2 that the radiating antenna 150 in the embodiment of the present invention has a higher electric field intensity at the same spatial point of the cylinder body than the flat plate antenna in the comparative example, that is, the energy density of the electromagnetic waves at this spatial point is higher, and higher heating efficiency may be obtained.
  • the heating device 100 may further include an antenna housing 130 to separate the inner space of the cylinder body 110 into a heating chamber 111 and an electrical appliance chamber 112.
  • the object to be processed and the radiating antenna 150 may be respectively disposed in the heating chamber 111 and the electrical appliance chamber 112 to separate the object to be processed from the radiating antenna 150, so as to prevent the radiating antenna 150 from being dirty or damaged by accidental touch.
  • the antenna housing 130 may be made of an insulating material, so that the electromagnetic waves generated by the radiating antenna 150 may pass through the antenna housing 130 to heat the object to be processed. Further, the antenna housing 130 may be made of a non-transparent material to reduce the electromagnetic loss of electromagnetic waves at the antenna housing 130, thereby increasing the heating rate of the object to be processed.
  • the above-mentioned non-transparent material is a translucent material or an opaque material.
  • the non-transparent material may be a PP material, a PC material or an ABS material.
  • the antenna housing 130 may also be configured to fix the radiating antenna 150 to simplify the assembly process of the heating device 100 and facilitate the positioning and installation of the radiating antenna 150.
  • the antenna housing 130 may include a clapboard 131 for separating the heating chamber 111 and the electrical appliance chamber 112, and a skirt part 132 fixedly connected with the inner wall of the cylinder body 110, wherein the central part 150a of the radiating antenna 150 may be configured to be fixedly connected with the clapboard 131.
  • the radiating antenna 150 may be configured to be engaged with the antenna housing 130.
  • Figure 5 is a schematic enlarged view of a region B in Figure 4 .
  • the radiating antenna 150 may be provided with a plurality of engaging holes 151; the antenna housing 130 may be correspondingly provided with a plurality of buckles 133; and the plurality of buckles 133 are configured to respectively pass through the plurality of engaging holes 151 to be engaged with the radiating antenna 150.
  • each of the buckles 133 may be composed of a fixing part perpendicular to the radiating antenna 150 and having a hollow middle part, and an elastic part extending inclining to the fixing part from the inner end edge of the fixing part and toward the antenna.
  • the antenna housing 130 may further include a plurality of reinforcing ribs, and the reinforcing ribs are configured to connect the clapboard 131 and the skirt part 132 so as to improve the structural strength of the antenna housing 130.
  • FIG 3 is a schematic enlarged view of a region A in Figure 2 .
  • the heating device 100 may further include a signal processing and measurement and control circuit 170.
  • the signal processing and measurement and control circuit 170 may include a detection unit 171, a control unit 172 and a matching unit 173.
  • the detection unit 171 may be connected in series between the electromagnetic generating module 161 and the radiating antenna 150, and is configured to detect in real time the specific parameters of incident wave signals and reflected wave signals passing through the detection unit.
  • the control unit 172 may be configured to acquire the specific parameters from the detection unit 171, and calculate the power of incident waves and reflected waves according to the specific parameters.
  • the specific parameters may be voltage values and/or current values.
  • the detection unit 171 may be a power meter to directly measure the power of incident waves and reflected waves.
  • the control unit 172 may further calculate an electromagnetic wave absorption rate of the object to be processed according to the power of incident waves and reflected waves, compare the electromagnetic wave absorption rate with a preset absorption threshold, and send an adjusting command to the matching unit 173 when the electromagnetic wave absorption rate is less than the preset absorption threshold.
  • the preset absorption threshold may be 60% to 80%, such as 60%, 70% or 80%.
  • the matching unit 173 may be connected in series between the electromagnetic generating module 161 and the radiating antenna 150, and is configured to adjust a load impedance of the electromagnetic generating module 161 according to an adjusting command of the control unit 172, so as to improve the matching degree between the output impedance and the load impedance of the electromagnetic generating module 161, so that when foods with different fixed attributes (such as type, weight and volume) are placed in the heating chamber 111, or during the temperature change of the foods, relatively more electromagnetic wave energy is radiated in the heating chamber 111, thereby increasing the heating rate.
  • different fixed attributes such as type, weight and volume
  • the heating device 100 may be used for thawing.
  • the control unit 172 may also be configured to calculate an imaginary part change rate of a dielectric coefficient of the object to be processed according to the power of incident waves and reflected waves, compare the imaginary part change rate with a preset change threshold, and send a stop command to the electromagnetic generating module 161 when the imaginary part change rate of the dielectric coefficient of the object to be processed is greater than or equal to the preset change threshold, so that the electromagnetic generating module 161 stops working, and the thawing program is terminated.
  • the preset change threshold may be obtained by testing the imaginary part change rate of the dielectric coefficient of foods with different fixed attributes at -3°C to 0°C, so that the foods have good shear strength. For example, when the object to be processed is raw beef, the preset change threshold may be set to 2.
  • the control unit 172 may also be configured to receive a user command and control the electromagnetic generating module 161 to start working according to the user command, wherein the control unit 172 is configured to be electrically connected with the power supply module 162 to obtain electric energy from the power supply module 162 and to be always in a standby state.
  • the signal processing and measurement and control circuit 170 may be integrated on a circuit board and horizontally disposed in the electrical appliance chamber 112 to facilitate the electrical connection between the radiating antenna 150 and a matching module.
  • the antenna housing 130 and the cylinder body 110 may be provided with heat dissipation holes 190 respectively in positions corresponding to the matching unit 173, so that the heat generated by the matching unit 173 during working is discharged through the heat dissipation holes 190.
  • the signal processing and measurement and control circuit 170 may be disposed on the rear side of the radiating antenna 150.
  • the heat dissipation holes 190 may be formed in the rear walls of the antenna housing 130 and the cylinder body 110.
  • the metal cylinder body 110 may be configured to be grounded to discharge the electric charges thereon, thereby improving the safety of the heating device 100.
  • the heating device 100 may further include a metal bracket 180.
  • the metal bracket 180 may be configured to connect the circuit board and the cylinder body 110 to support the circuit board and discharge the electric charges on the circuit board through the cylinder body 110.
  • the metal bracket 180 may be composed of two parts perpendicular to each other. The metal bracket 180 may be fixedly connected with the circuit board and the cylinder body 110 in advance.
  • the electromagnetic generating module 161 and the power supply module 162 may be disposed on the outer side of the cylinder body 110.
  • a part of the metal bracket 180 may be disposed at the rear part of the circuit board and extend vertically along a lateral direction, and may be provided with two wiring ports, so that the wiring terminal of the detection unit 171 (or the matching unit 173) extends out from one wiring port and is electrically connected with the electromagnetic generating module 161, and the wiring terminal of the control unit 172 extends out from the other wiring port and is electrically connected with the electromagnetic generating module 161 and the power supply module 162.
  • the cylinder body 110 and the door body 120 may be respectively provided with electromagnetic shielding features, so that the door body 120 is conductively connected with the cylinder body 110 when the door body is in a closed state, so as to prevent electromagnetic leakage.
  • the heating device 100 may be disposed in a storage compartment of a refrigerator to facilitate users thawing the food.

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  • Engineering & Computer Science (AREA)
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  • Life Sciences & Earth Sciences (AREA)
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Description

    Technical Field
  • The present invention relates to kitchen appliances, and particularly relates to an electromagnetic wave heating device.
  • Background Art
  • In the freezing process of food, the quality of the food is maintained, but the frozen food needs to be thawed before processing or eating. In order to facilitate users freezing and thawing the food, in the prior art, the food is generally thawed by an electromagnetic wave device.
  • The temperature uniformity of the thawed food is closely related to the distribution uniformity of electromagnetic waves in a heating chamber. When there is a gap between a radiating antenna and the inner walls of the heating chamber in the circumferential direction of the radiating antenna, the electromagnetic waves in the heating chamber will be concentrated at the peripheral edge of the radiating antenna due to the edge effect of the radiating antenna. In the prior art, in order to solve this problem, the radiating antenna is configured to at least cover one inner wall of the heating chamber, so that the food is thawed uniformly. However, this solution not only has high production cost, but also cannot solve the problem that electromagnetic waves arc concentrated at the peripheral edge of the antenna to cause local heating or even ignition of the antenna.
  • CN102525249B discloses a heating cooking device capable of inhibiting the radiation of the microwaves from the periphery of the antenna. The antenna (23), in a curved shape, approaches the base board (11a) of a housing (11) by moving toward the periphery away from the upper end portion of a cable shaft (20).
  • US8987644B2 discloses a high-frequency heating apparatus including a heating chamber to which a heating plate for loading a subject to be heated thereon is detachably attached, a microwave generating unit, a waveguide for transmitting a microwave from the microwave generating unit, a rotation antenna for radiating the microwave into the heating chamber from the waveguide, a driving unit for turning/driving the rotation antenna, an operating portion capable of choosing the grill menu by which the subject to be heated put on the heating plate is heated and a hot-up menu by which the subject to be heated is heated without the heating plate, and a controlling unit for controlling the driving unit based on an output signal form the operating portion, wherein the controlling unit controls to vary a direction of a sharp portion of a radiation directivity of the rotation antenna in response to the output signal from the operating portion.
  • CN102644946A relates to a cooking device comprising a body, a microwave generator, a rotatable antenna, a current/voltage detection unit and a control unit, wherein the body forms a cooking box including a plurality of zones; each one of the zones is used for containing the objects; the microwave generator generates the microwave; the rotatable antenna radiates the microwave generated by the microwave generator to the cooking box, and has directivity; the current/voltage detection unit and a control unit detects the change of the current or voltage of the microwave generating unit related with the position of the rotatable antenna when the rotatable antenna performs on rotation; and the control unit determines the position of the rotatable antenna when the microwave generator gets the operation efficiency being greater than the preset value according to the change of the current or voltage detected by the current/voltage detection unit, and suspends the rotatable antenna at the determined position.
  • CN1237308C discloses a high-frequency cooker with an antenna driving part 17 for stopping the antenna 16 at a first position for radiating the microwaves from at least a specific position of die antenna 16 and at a second position for radiating the microwaves from the circumference of the antenna 16 by vertically moving the antenna 16 disposed in a lower part of a food mounting surface 11 of a heating chamber 7. Further, an infrared sensor 18 for detecting the temperature of the food and a control part for controlling a magnetron 15 are present. The control part is so structured as to determine the position of the antenna 16 according the detected temperature by the infrared sensor 18.
  • EP3240366 A1 discloses a waveguide structure antenna (5) with a ceiling surface (9) and side wall surfaces (10a, 10b, 10c) defining a waveguide structure section (8), as well as a front opening (13) to emit microwaves from front opening (13) toward a heating-target object.
  • JP2010199009A teaches the arrangement of the bent portion 19 at an edge portion of a horn antenna 7 opening, for making directivity in the direction of the opening and the directivity in the direction of the bent portion compatible. Thus, when two items are placed, only a targeted one between the two can be heated intensively as the directivity in the opening direction of the horn antenna 7 becomes dominant, and outward directivity from the center of a heating chamber bottom surface becomes higher. EP2348257 (A1 ) discloses a heating chamber (34) provided with glass-fitted door (31b) at a front opening, for housing an object to be heated, a waveguide (33) for transmitting microwaves from microwave generating section (32) to heating chamber (34), a directional feeding section (39) having directivity, for supplying the microwaves from waveguide (33) to heating chamber (34), a driving section (41) for rotationally driving directional feeding section (39) and a control section (411) for controlling driving section (41) to turn directional feeding section (39) to a direction of the door and supply the microwaves into a space above the tray, using the inside of the glass as a principal transmission channel, wherein a defrosting function and a grilling function arc performed in an automatic and continuous manner without a user's operation.
  • By comprehensive consideration, an electromagnetic wave heating device with low production cost and uniform distribution of electromagnetic waves is required in design.
  • Summary of the Invention
  • One objective of the present invention is to provide an electromagnetic wave heating device with low production cost and uniform distribution of electromagnetic waves.
  • Specifically, the present invention provides a heating device, including:
    • a cylinder body, in which a heating chamber having a pick-and-place opening is defined, and the heating chamber is configured to place an object to be processed;
    • a door body, disposed at the pick-and-place opening and configured to open and close the pick-and-place opening;
    • an electromagnetic generating module, configured to generate an electromagnetic wave signal; and
    • a radiating antenna, disposed in the cylinder body and electrically connected with the electromagnetic generating module to generate electromagnetic waves of a corresponding frequency according to the electromagnetic wave signal, wherein
    • the radiating antenna is configured to arch in a direction close to a position for placing the object to be processed, so as to make a distribution of the electromagnetic waves in the heating chamber more uniform.
  • The radiating antenna includes:
    • a central part and an edge part, wherein the edge part is disposed on one side of the central part away from the position for placing object to be processed and extends parallel to the central part; and
    • a connecting part, configured to connect the central part and the edge part.
  • The connecting part is configured to extend divergently from a peripheral edge of the central part to an inner peripheral edge of the edge part.
  • The connecting part includes:
    • a first arc segment, configured to extend from the peripheral edge of the central part to a direction close to the edge part and to be tangent to the central part;
    • a straight-line segment, configured to be tangent to the first arc segment: and
    • a second arc segment, configured to connect an outer peripheral edge of the straight-line segment and the inner peripheral edge of the edge part and to be tangent to the straight-line segment and the edge part.
  • Optionally, geometric centers of the central part, the connecting part and the edge part all coincide with a center of a maximum cross section of the heating chamber taken along an imaginary plane parallel to the central part.
  • Optionally, the central part is in a shape of an oblong; and
    a length direction of the central part is parallel to a length direction of the cross section.
  • Optionally, a length of the central part is 0.386 to 0.522 times a length of the cross section; and/or
    • a width of the central part is 0.19 to 0.471 times a width of the cross section; and/or
    • a fillet radius of the central part is 0.2 to 0.4 times the width of the central part; and/or
    • a length of an outer end edge of the edge part is 0.519 to 0.674 times the length of the cross section; and/or
    • a width of the outer end edge of the edge part is 0.38 to 0.62 times the width of the cross section; and/or
    • a fillet radius of the outer end edge of the edge part is 0.2 to 0.4 times the width of the outer end edge of the edge part; and/or
    • a radius of the first arc segment is greater than or equal to 1/3 of a spacing between the central part and the edge part in a direction perpendicular to the central part;
    • an included angle between the straight-line segment and the central part is 120° to 160°; and
    • a radius of the second arc segment is greater than or equal to 1/6 of a spacing between the central part and the edge part in a direction perpendicular to the central part.
  • Optionally, the central part extends horizontally;
    • the central part is disposed at a height of 0.285 to 0.5 of the cylinder body; and
    • the edge part is disposed at a height of 0.19 to 0.334 of the cylinder body.
  • Optionally, the heating device further includes:
    • an antenna housing, made of an insulating material and configured to separate an inner space of the cylinder body into an electrical appliance chamber and the heating chamber, wherein
    • the radiating antenna is disposed in the electrical appliance chamber, and the central part thereof is fixedly connected with the antenna housing.
  • Optionally, the central part is provided with a plurality of engaging holes; and
    • the antenna housing is correspondingly provided with a plurality of buckles, and the plurality of buckles are configured to respectively pass through the plurality of engaging holes to be engaged with the central part, wherein
    • each of the buckles is composed of a fixing part perpendicular to the central part and having a hollow middle part, and an elastic part extending inclining to the fixing part from an inner end edge of the fixing part and toward the central part.
  • The present invention creatively disposes the radiating antenna to arch in a direction close to the object to be processed, which can relatively reduce the distance between the center of the radiating antenna and a receiving pole and increase the distance between the peripheral edge of the radiating antenna and the receiving pole, thereby eliminating the influence of an edge effect on the distribution uniformity of the electromagnetic waves in the heating chamber, and increasing the energy density and distribution range of the electromagnetic waves while solving the problem of the production cost and improving the distribution uniformity of the electromagnetic waves.
  • According to the following detailed descriptions of specific embodiments of the present invention in conjunction with the drawings, those skilled in the art will more clearly understand the above and other objectives, advantages and features of the present invention.
  • Brief Description of the Drawings
  • Some specific embodiments of the present invention are described in detail below with reference to the drawings by way of example and not limitation. The same reference numerals in the drawings indicate the same or similar components or parts. Those skilled in the art should understand that these drawings arc not necessarily drawn in scale. In figures:
    • Figure 1 is a schematic structural view of a heating device according to one embodiment of the present invention.
    • Figure 2 is a schematic cross-sectional view of the heating device as shown in Figure 1, wherein an electromagnetic generating module and a power supply module are omitted.
    • Figure 3 is a schematic enlarged view of a region A in Figure 2.
    • Figure 4 is a schematic structural view of an electrical appliance chamber according to one embodiment of the present invention.
    • Figure 5 is a schematic enlarged view of a region B in Figure 4.
    • Figure 6 is a schematic sectional view of a heating device taken along a lateral direction and a vertical direction.
    • Figure 7 is a schematic sectional view of a heating device taken along a front-back direction and a vertical direction.
    • Figure 8 is a test view of a radiating antenna according to one embodiment of the present invention.
    • Figure 9 is a simulated view of distribution of electromagnetic waves measured based on Figure 8.
    • Figure 10 is a test view of a radiating antenna according to a comparative example of the present invention.
    • Figure 11 is a simulated view of distribution of electromagnetic waves measured based on Figure 10.
    Detailed Description of the Invention
  • Figure 1 is a schematic structural view of a heating device 100 according to one embodiment of the present invention. Figure 2 is a schematic cross-sectional view of the heating device 100 as shown in Figure 1, wherein an electromagnetic generating module 161 and a power supply module 162 are omitted. Referring to Figure 1 and Figure 2, the heating device 100 may include a cylinder body 110, a door body 120, an electromagnetic generating module 161, a power supply module 162 and a radiating antenna 150.
  • A heating chamber 111 having a pick-and-place opening is defined in the cylinder body 110, and the heating chamber 111 is configured to place an object to be processed. The pick-and-placc opening may be formed in the front wall or the top wall of the heating chamber 111 so as to pick and place the object to be processed.
  • The door body 120 may be installed together with the cylinder body 110 by an appropriate method, such as a sliding rail connection, a hinged connection, etc., and is configured to open and close the pick-and-place opening. In an illustrated embodiment, the heating device 100 also includes a drawer 140 for carrying the object to be processed; a front end plate of the drawer 140 is configured to be fixedly connected with the door body 120, and two lateral side plates of the drawer are movably connected with the cylinder body 110 by sliding rails.
  • The power supply module 162 may be configured to be electrically connected with the electromagnetic generating module 161 to provide electric energy to the electromagnetic generating module 161, so that the electromagnetic generating module 161 generates electromagnetic wave signals. The radiating antenna 150 may be disposed in the cylinder body 110 and is electrically connected with the electromagnetic generating module 161 to generate electromagnetic waves of corresponding frequencies according to the electromagnetic wave signals, so as to heat the object to be processed in the cylinder body 110.
  • When the pick-and-place opening is formed in the front wall of the cylinder body 110, the radiating antenna 150 may be disposed at the top, bottom, two lateral sides or rear of the cylinder body 110. When the pick-and-place opening is formed in the top wall of the cylinder body 110, the radiating antenna 150 may be disposed at the peripheral side or bottom of the cylinder body 110. Preferably, the radiating antenna 150 is disposed at the bottom of the cylinder body 110 to avoid the damage to the antenna due to an excessively high object to be processed in the drawer 140, and the antenna may be hidden by the drawer 140.
  • Hereinafter, the technical solution of the present invention is described in detail by taking the radiating antenna 150 disposed at the bottom of the cylinder body 110 as an example.
  • In some embodiments, the cylinder body 110 may be made of metals to serve as a receiving pole to receive electromagnetic waves generated by the radiating antenna 150. In some other embodiments, a receiving pole plate may be disposed on the top wall of the cylinder body 110 to receive electromagnetic waves generated by the radiating antenna 150.
  • Figure 4 is a schematic structural view of an electrical appliance chamber 112 according to one embodiment of the present invention. Referring to Figure 4, the radiating antenna 150 may be configured to arch upward to relatively reduce the distance between the center of the radiating antenna 150 and the top wall of the cylinder body 110 and increase the distance between the peripheral edge of the radiating antenna 150 and the top wall of the cylinder body 110, thereby eliminating the influence of an edge effect on the distribution uniformity of the electromagnetic waves in the heating chamber 111, and increasing the energy density and distribution range of the electromagnetic waves while improving the distribution uniformity of the electromagnetic waves.
  • It is well-known to those skilled in the art that the edge effect means that the magnetic field intensity at the peripheral edge of the antenna is much higher than the magnetic field intensity at the center of die antenna.
  • Specifically, the radiating antenna 150 includes a central part 150a, an edge part 150c and a connecting part 150b for connecting the central part 150a and the edge part 150c. The central part 150a may extend along a horizontal direction. The edge part 150c may be disposed under the central part 150a, and extends parallel to the central part 150a. The connecting part 150b is configured to divergently extend from the peripheral edge of the central part 150a to the inner peripheral edge of the edge part 150c, so as to further improve the distribution uniformity of the electromagnetic waves in the heating chamber 111.
  • According to the invention, the connecting part 150b includes a first arc segment, a straight-line segment and a second arc segment which are sequentially connected from the peripheral edge of the central part 150a to the inner peripheral edge of the edge part 150c, wherein the first arc segment is configured to be tangent to the central part 150a, the straight-line segment is configured to be tangent to the first arc segment, and the second arc segment is configured to be tangent to the straight-line segment and the edge part 150c, so as to avoid the generation of the edge effect at sharp corners, and further improve the distribution uniformity of the electromagnetic waves in the heating chamber 111.
  • In some embodiments, the geometric centers of the central part 150a, the connecting part 150b and the edge part 150c all coincide with the center of a maximum cross section of the heating chamber 111 taken along an imaginary plane extending horizontally, so as to enable the electromagnetic waves in the heating chamber 111 to be distributed more uniformly.
  • In some embodiments, the heating chamber 111 may be in a shape of a rectangle. Adaptively, the central part 150a may be in a shape of an oblong, and the length direction of the central part 150a may be parallel to the length direction of the above-mentioned cross section, so that the electromagnetic waves in the heating chamber 111 are distributed more uniformly.
  • In some embodiments, the length w1 of the central part 150a may be 0.386 to 0.522 (such as 0.386, 0.45 or 0.522) times the length W of the above-mentioned cross section. The width d1 of the central part 150a may be 0.19 to 0.471 (such as 0.19, 0.2, 0.375 or 0.471) times the width D of the above-mentioned cross section. The fillet radius of the central part 150a may be 0.2 to 0.4 (such as 0.2, 0.33 or 0.4) times die width d1 of the central part 150a. The length w2 of the outer end edge of the edge part 150c may be 0.519 to 0.674 (such as 0.519, 0.6 or 0.674) times the length W of the above-mentioned cross section. The width d2 of the outer end edge of the edge part 150c may be 0.38 to 0.62 (such as 0.38, 0.5 or 0.62) times the width D of the above-mentioned cross section. The fillet radius of the outer end edge of the edge part 150c may be 0.2 to 0.4 (such as 0.2, 0.33 or 0.4) times the width d2 of the outer end edge of the edge part 150c. The radius r1 of the first arc segment may be greater than or equal to 1/3 of the spacing (h1-h2) between the central part 150a and the edge part 150c in a vertical direction, for example, may be 1/3, 2/5 or 1/2 of the spacing between the central part 150a and the edge part 150c in a vertical direction. An included angle α between the straight-line segment and the central part 150a may be 120° to 160°, such as 120°, 140° or 160°. The radius r2 of the second arc segment may be greater than or equal to 1/6 of the spacing (h1-h2) between the central part 150a and the edge part 150c, for example, may be 1/6, 1/5, 1/3 or 1/2 of the spacing between the central part 150a and the edge part 150c in a vertical direction. In the present invention, by limiting each size of the radiating antenna 150 in a horizontal direction, the production cost can be saved, and at the same time, the electromagnetic waves in the heating chamber 111 can have a relatively large distribution area in the horizontal direction.
  • The central part 150a may be disposed at a height (h1/H) of 0.285 to 0.5 (such as 0.285, 0.292, 0.33, 0.4 or 0.5) of the cylinder body 110. The edge part 150c may be disposed at a height (h2/H) of 0.19 to 0.334 (such as 0.19, 0.195, 0.2, 0.25 or 0.334) of the cylinder body 110. In the present invention, by limiting the setting height of the radiating antenna 150 in the vertical direction, the volume of the heating chamber 111 can be relatively large, and at the same time, the electromagnetic waves in the heating chamber 111 can have a relatively high energy density.
  • In order to further understand the present invention, the preferred implementation solutions of the present invention are described below in conjunction with more specific embodiments.
  • Figure 8 is a test view of a radiating antenna according to one embodiment of the present invention. Referring to Figure 8, the radiating antenna is a radiating antenna according to one embodiment of the present invention, and parameters of the radiating antenna are: w1=154 mm, d1=86 mm, w2=205 mm, d2=115 mm, r1=10 mm, α=130°, r2=5 mm, h1=50 mm, h2=34 mm; the fillet radius of the central part 150a is 28 mm; and the fillet radius of the outer end edge of the edge part 150c is 38 mm.
  • Figure 10 is a test view of a radiating antenna according to a comparative example of the present invention. Referring to Figure 8, the radiating antenna is a flat plate antenna, and the antenna is in a shape of an oblong, with a length of 205 mm, a width of 115 mm, a fillet radius of 38 mm, and a distance of 50 mm between the antenna and the bottom wall.
  • Test specification: the radiating antenna in the embodiment of Figure 8 and the radiating antenna in the comparative example of Figure 10 are respectively placed in a cylinder body (W=342 mm, D=230 mm, H=171 mm) for simulation experiments.
  • Figure 9 is a simulated view of distribution of electromagnetic waves measured by Figure 8. Figure 11 is a simulated view of distribution of electromagnetic waves measured by Figure 10. In order to clearly compare the distribution difference of the electromagnetic waves between the embodiment and the comparative example, both the simulated view in Figure 9 and the simulated view in Figure 11 are set as follows: when the magnetic field intensity at any spatial point in the cylinder body is greater than an intensity value (the intensity value is the difference between the magnetic field intensity at the center of the antenna in the embodiment of Figure 8 and the magnetic field intensity at the center of the antenna in the comparative example of Figure 10), the spatial point is shown as having electromagnetic waves.
  • It can be seen from Figure 9 and Figure 11 that compared with the flat plate antenna in the comparative example, the radiating antenna 150 in the embodiment of the present invention has no hidden trouble of magnetic field concentration and has a uniform distribution and a relatively large distribution range of electromagnetic waves. Table 1 Electric field intensity test table a
    Measuring point X Y Z Electric field intensity
    m1 15.500 66.000 401.830 2.782e+003
    m2 15.500 66.000 457.700 3.059e+003
    m3 110.500 66.000 401.830 3.181e+003
    m4 15.500 66.000 347.700 2.829e+003
    m5 -79.500 66.000 401.830 3.060e+003
    Table 2 Electric field intensity test table b
    Measuring point X Y Z Electric field intensity
    m1 15.600 66.000 401.830 1.206e+003
    m2 15.500 66.000 457.700 1.813e+003
    m3 110.500 66.000 401.830 1.896c+003
    m4 15.500 66.000 347.500 1.446e+003
    m5 -79.500 66.000 401.830 1.685e+003
  • Table 1 is an electric field intensity test table in Figure 9. Table 2 is an electric field intensity test table in Figure 11. It can be seen from Table 1 and Table 2 that the radiating antenna 150 in the embodiment of the present invention has a higher electric field intensity at the same spatial point of the cylinder body than the flat plate antenna in the comparative example, that is, the energy density of the electromagnetic waves at this spatial point is higher, and higher heating efficiency may be obtained.
  • Referring to Figure 2 and Figure 4, the heating device 100 may further include an antenna housing 130 to separate the inner space of the cylinder body 110 into a heating chamber 111 and an electrical appliance chamber 112. The object to be processed and the radiating antenna 150 may be respectively disposed in the heating chamber 111 and the electrical appliance chamber 112 to separate the object to be processed from the radiating antenna 150, so as to prevent the radiating antenna 150 from being dirty or damaged by accidental touch.
  • In some embodiments, the antenna housing 130 may be made of an insulating material, so that the electromagnetic waves generated by the radiating antenna 150 may pass through the antenna housing 130 to heat the object to be processed. Further, the antenna housing 130 may be made of a non-transparent material to reduce the electromagnetic loss of electromagnetic waves at the antenna housing 130, thereby increasing the heating rate of the object to be processed. The above-mentioned non-transparent material is a translucent material or an opaque material. The non-transparent material may be a PP material, a PC material or an ABS material.
  • The antenna housing 130 may also be configured to fix the radiating antenna 150 to simplify the assembly process of the heating device 100 and facilitate the positioning and installation of the radiating antenna 150. Specifically, the antenna housing 130 may include a clapboard 131 for separating the heating chamber 111 and the electrical appliance chamber 112, and a skirt part 132 fixedly connected with the inner wall of the cylinder body 110, wherein the central part 150a of the radiating antenna 150 may be configured to be fixedly connected with the clapboard 131.
  • In some embodiments, the radiating antenna 150 may be configured to be engaged with the antenna housing 130. Figure 5 is a schematic enlarged view of a region B in Figure 4. Referring to Figure 5, the radiating antenna 150 may be provided with a plurality of engaging holes 151; the antenna housing 130 may be correspondingly provided with a plurality of buckles 133; and the plurality of buckles 133 are configured to respectively pass through the plurality of engaging holes 151 to be engaged with the radiating antenna 150.
  • Specifically, each of the buckles 133 may be composed of a fixing part perpendicular to the radiating antenna 150 and having a hollow middle part, and an elastic part extending inclining to the fixing part from the inner end edge of the fixing part and toward the antenna.
  • The antenna housing 130 may further include a plurality of reinforcing ribs, and the reinforcing ribs are configured to connect the clapboard 131 and the skirt part 132 so as to improve the structural strength of the antenna housing 130.
  • Figure 3 is a schematic enlarged view of a region A in Figure 2. Referring to Figure 1 to Figure 3, the heating device 100 may further include a signal processing and measurement and control circuit 170. Specifically, the signal processing and measurement and control circuit 170 may include a detection unit 171, a control unit 172 and a matching unit 173.
  • The detection unit 171 may be connected in series between the electromagnetic generating module 161 and the radiating antenna 150, and is configured to detect in real time the specific parameters of incident wave signals and reflected wave signals passing through the detection unit.
  • The control unit 172 may be configured to acquire the specific parameters from the detection unit 171, and calculate the power of incident waves and reflected waves according to the specific parameters. In the present invention, the specific parameters may be voltage values and/or current values. Alternatively, the detection unit 171 may be a power meter to directly measure the power of incident waves and reflected waves.
  • The control unit 172 may further calculate an electromagnetic wave absorption rate of the object to be processed according to the power of incident waves and reflected waves, compare the electromagnetic wave absorption rate with a preset absorption threshold, and send an adjusting command to the matching unit 173 when the electromagnetic wave absorption rate is less than the preset absorption threshold. The preset absorption threshold may be 60% to 80%, such as 60%, 70% or 80%.
  • The matching unit 173 may be connected in series between the electromagnetic generating module 161 and the radiating antenna 150, and is configured to adjust a load impedance of the electromagnetic generating module 161 according to an adjusting command of the control unit 172, so as to improve the matching degree between the output impedance and the load impedance of the electromagnetic generating module 161, so that when foods with different fixed attributes (such as type, weight and volume) are placed in the heating chamber 111, or during the temperature change of the foods, relatively more electromagnetic wave energy is radiated in the heating chamber 111, thereby increasing the heating rate.
  • In some embodiments, the heating device 100 may be used for thawing. The control unit 172 may also be configured to calculate an imaginary part change rate of a dielectric coefficient of the object to be processed according to the power of incident waves and reflected waves, compare the imaginary part change rate with a preset change threshold, and send a stop command to the electromagnetic generating module 161 when the imaginary part change rate of the dielectric coefficient of the object to be processed is greater than or equal to the preset change threshold, so that the electromagnetic generating module 161 stops working, and the thawing program is terminated.
  • The preset change threshold may be obtained by testing the imaginary part change rate of the dielectric coefficient of foods with different fixed attributes at -3°C to 0°C, so that the foods have good shear strength. For example, when the object to be processed is raw beef, the preset change threshold may be set to 2.
  • The control unit 172 may also be configured to receive a user command and control the electromagnetic generating module 161 to start working according to the user command, wherein the control unit 172 is configured to be electrically connected with the power supply module 162 to obtain electric energy from the power supply module 162 and to be always in a standby state.
  • In some embodiments, the signal processing and measurement and control circuit 170 may be integrated on a circuit board and horizontally disposed in the electrical appliance chamber 112 to facilitate the electrical connection between the radiating antenna 150 and a matching module.
  • The antenna housing 130 and the cylinder body 110 may be provided with heat dissipation holes 190 respectively in positions corresponding to the matching unit 173, so that the heat generated by the matching unit 173 during working is discharged through the heat dissipation holes 190. In some embodiments, the signal processing and measurement and control circuit 170 may be disposed on the rear side of the radiating antenna 150. The heat dissipation holes 190 may be formed in the rear walls of the antenna housing 130 and the cylinder body 110.
  • In some embodiments, the metal cylinder body 110 may be configured to be grounded to discharge the electric charges thereon, thereby improving the safety of the heating device 100.
  • The heating device 100 may further include a metal bracket 180. The metal bracket 180 may be configured to connect the circuit board and the cylinder body 110 to support the circuit board and discharge the electric charges on the circuit board through the cylinder body 110. In some embodiments, the metal bracket 180 may be composed of two parts perpendicular to each other. The metal bracket 180 may be fixedly connected with the circuit board and the cylinder body 110 in advance.
  • In some embodiments, the electromagnetic generating module 161 and the power supply module 162 may be disposed on the outer side of the cylinder body 110. A part of the metal bracket 180 may be disposed at the rear part of the circuit board and extend vertically along a lateral direction, and may be provided with two wiring ports, so that the wiring terminal of the detection unit 171 (or the matching unit 173) extends out from one wiring port and is electrically connected with the electromagnetic generating module 161, and the wiring terminal of the control unit 172 extends out from the other wiring port and is electrically connected with the electromagnetic generating module 161 and the power supply module 162.
  • In some embodiments, the cylinder body 110 and the door body 120 may be respectively provided with electromagnetic shielding features, so that the door body 120 is conductively connected with the cylinder body 110 when the door body is in a closed state, so as to prevent electromagnetic leakage.
  • In some embodiments, the heating device 100 may be disposed in a storage compartment of a refrigerator to facilitate users thawing the food.
  • Hereto, those skilled in the art should realize that although multiple exemplary embodiments of the present invention have been shown and described in detail herein, without departing from the scope of the present invention.

Claims (7)

  1. A heating device (100), comprising:
    a cylinder body (110), in which a heating chamber (111) having a pick-and-place opening is defined, and the heating chamber (111) is configured to place an object to be processed;
    a door body (120), disposed at the pick-and-place opening and configured to open and close the pick-and-place opening;
    an electromagnetic generating module (161), configured to generate an electromagnetic wave signal; and
    a radiating antenna (150), disposed in the cylinder body (110) and electrically connected with the electromagnetic generating module (161) to generate electromagnetic waves of a corresponding frequency according to the electromagnetic wave signal, wherein the radiating antenna (150) comprises:
    a central part (150a) and an edge part (150c), wherein the edge part (150c) is disposed on one side of the central part (150a) away from a position for placing the object to be processed in the heating chamber (111) and extends parallel to the central part (150a) and
    a connecting part (150b), configured to connect the central part (150a) and the edge part (150c), wherein
    the connecting part (150b) extends divergently from a peripheral edge of the central part (150a) to an inner peripheral edge of the edge part (150c) and wherein
    the radiating antenna (150) is arched in a direction close to the position for placing the object to be processed in the heating chamber (111), whereby the distance between the center of the radiating antenna (150) and a receiving pole is reduced and the distance between the peripheral edge of the radiating antenna (150) and the receiving pole is increased, so as to make a distribution of the electromagnetic waves in the heating chamber (111) more uniform, characterised in that
    the connecting part (150b) comprises:
    a first arc segment, extending from the peripheral edge of the central part (150a) to a direction close to the edge part (150c) and to be tangent to the central part (150a);
    a straight-line segment, being tangent to the first arc segment; and
    a second arc segment, connecting an outer peripheral edge of the straight-line segment and the inner peripheral edge of the edge part (150c) and being tangent to the straight-line segment and the edge part (150c).
  2. The heating device (100) according to claim 1, wherein geometric centers of the central part (150a), the connecting part (150b) and the edge part (150c) all coincide with the center of the maximum cross section of the heating chamber (111) taken along an imaginary plane parallel to the central part (150a).
  3. The heating device (100) according to claim 2, wherein
    the central part (150a) is in the shape of an oblong; and
    the length direction of the central part (150a) is parallel to the length direction of the cross section.
  4. The heating device (100) according to claim 3, wherein
    the length (w1) of the central part (150a) is 0.386 to 0.522 times the length (W) of the cross section; and/or
    the width (d1) of the central part (150a) is 0.19 to 0.471 times the width (D) of the cross section; and/or
    the fillet radius of the central part (150a) is 0.2 to 0.4 times the width (d1) of the central part (150a); and/or
    the length (w2) of the outer end edge of the edge part (150c) is 0.519 to 0.674 times the length (W) of the cross section; and/or
    the width (d2) of the outer end edge of the edge part (150c) is 0.38 to 0.62 times the width (D) of the cross section; and/or
    the fillet radius of the outer end edge of the edge part (150c) is 0.2 to 0.4 times the width (d2) of the outer end edge of the edge part (150c); and/or
    the radius (r1) of the first arc segment is greater than or equal to 1/3 of the spacing (h1-h2) between the central part (150a) and the edge part (150c) in a direction perpendicular to the central part (150a);
    the included angle (α) between the straight-line segment and the central part (150a) is 120° to 160°; and
    the radius (r2) of the second arc segment is greater than or equal to 1/6 of the spacing (h1-h2) between the central part (150a) and the edge part (150c) in a direction perpendicular to the central part (150a).
  5. The heating device (100) according to claim 1 or 4, wherein
    the central part (150a) extends horizontally;
    the central part (150a) is disposed at a height (h1) of 0.285 to 0.5 times of the height (H) of the cylinder body (110); and
    the edge part (150c) is disposed at a height (h2) of 0.19 to 0.334 times the height (H) of the cylinder body (110).
  6. The heating device (100) according to claim 1, further comprising:
    an antenna housing (130), made of an insulating material and configured to separate an inner space of the cylinder body (110) into an electrical appliance chamber and the heating chamber (111), wherein
    the radiating antenna (150) is disposed in the electrical appliance chamber, and the central part (150a) thereof is fixedly connected with the antenna housing (130).
  7. The heating device (100) according to claim 6, wherein
    the central part (150a) is provided with a plurality of engaging holes (151); and
    the antenna housing (130) is correspondingly provided with a plurality of buckles, and the plurality of buckles arc configured to respectively pass through the plurality of engaging holes (151) to be engaged with the central part (150a), wherein
    each of the buckles is composed of a fixing part perpendicular to the central part (150a) and having a hollow middle part, and an elastic part extending inclining to the fixing part from an inner end edge of the fixing part and toward the central part (150a).
EP20736226.0A 2019-01-04 2020-01-03 Heating device Active EP3905849B1 (en)

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CN201910009511.2A CN111417226A (en) 2019-01-04 2019-01-04 Heating device
PCT/CN2020/070343 WO2020140989A1 (en) 2019-01-04 2020-01-03 Heating device

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EP3905849A4 EP3905849A4 (en) 2022-03-09
EP3905849B1 true EP3905849B1 (en) 2023-10-04

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AU2020205145B2 (en) 2023-02-16
US20220086963A1 (en) 2022-03-17
EP3905849A4 (en) 2022-03-09
WO2020140989A1 (en) 2020-07-09
US12193130B2 (en) 2025-01-07
EP3905849A1 (en) 2021-11-03
CN111417226A (en) 2020-07-14
AU2020205145A1 (en) 2021-07-22

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